body {
            font-family: Arial, sans-serif;
            background-image: url("{% static 'images/ChatGPT_Image.png' %}");
            background-size: cover;
            background-position: center;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .login-container {
            background-color: white;
            padding: 20px;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            text-align: center;
            max-width: 400px;
            width: 100%;
        }
        .login-container h1 {
            margin-top: 0;
        }
        .login-container label {
            display: block;
            margin: 10px 0 5px;
        }
        .login-container input[type="text"],
        .login-container input[type="password"] {
            width: 100%;
            padding: 12px 20px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: rgba(255, 255, 255, 0.9);
        }
        
        .login-container input:focus {
            border-color: #667eea;
            box-shadow: 0 0 8px rgba(102, 126, 234, 0.3);
        }
        
        .login-container input[type="submit"] {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            border-radius: 8px;
            padding: 14px;
            font-size: 16px;
            font-weight: 600;
            letter-spacing: 1px;
            transition: all 0.3s ease;
        }
        
        .login-container input[type="submit"]:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
        }
        .login-container input[type="submit"]:hover {
            background-color: #45a049;
        }

        /* 新增公共样式 */
        .gradient-btn {
            transition: all 0.3s ease;
        }

        .gradient-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
        }

        .error-message {
            padding: 12px;
            background: rgba(220, 53, 69, 0.1);
            border-radius: 8px;
            border: 1px solid rgba(220, 53, 69, 0.2);
        }